INVESTIGATION OF NUCLEAR STRUCTURE OF EVEN–EVEN 98–136Cd, 102–136Te AND 114–146Xe ISOTOPES

2011 ◽  
Vol 26 (19) ◽  
pp. 1413-1425
Author(s):  
HÜSEYIN AYTEKIN
Keyword(s):  
Cross Sections ◽  
Nuclear Reactions ◽  
Closed Shell ◽  
Binding Energies ◽  
Proton Density ◽  
Neutron Density ◽  
Charge Radii ◽  
Hartree Fock ◽  
Unstable Nuclei ◽  
Sly4 Force

In this paper, the ground state properties of neutron rich even–even Cd, Te and Xe isotopes are investigated using the Skyrme–Hartree–Fock–Bogoliubov (SHFB) methods with SKM* and SLy4 force parameters. These isotopes are vital to the structural studies of unstable nuclei taking place at near Z = 50 closed shell. The main subject of this paper is to calculate the binding energies per particle, the rms nuclear charge radii, the rms nuclear proton density radii, and the rms nuclear neutron density radii with SHFB methods. The results are compared with experimental data and with the results of relativistic meanfield theory (RMFT). In addition to these calculations the initial neutron and proton exciton numbers for 112 Cd , 124 Te and 126 Xe isotopes, which have high cross sections for proton induced nuclear reactions (p, 2n) and used for radioisotopes production, will also be calculated. These exciton numbers can be used for pre-equilibrium proton induced (p, 2n) reactions on 112 Cd , 124 Te and 126 Xe isotopes.

scholarly journals Global predictions for astrophysics applications

2020 ◽  
Vol 13 ◽  
pp. 18
Author(s):  
P. Demetriou
Keyword(s):  
Nuclear Reaction ◽  
Cross Sections ◽  
Nuclear Reactions ◽  
Nuclear Astrophysics ◽  
Reaction Network ◽  
Reaction Rates ◽  
Reaction Cross ◽  
Hartree Fock ◽  
Microscopic Models ◽  
The Stability

Nuclear reaction rates play a crucial role in nuclear astrophysics. In the last decades there has been an enormous effort to measure reaction cross sections and extensive experimental databases have been compiled as a result. In spite of these efforts, most nuclear reaction network calculations still have to rely on theoretical predic- tions of experimentally unknown rates. In particular, in astrophysics applications such as the s-, r- and p-process nucleosynthesis involving a large number of nuclei and nuclear reactions (thousands). Moreover, most of the ingredients of the cal- culations of reaction rates have to be extrapolated to energy and/or mass regions that cannot be explored experimentally. For this reason it is important to develop global microscopic or semi-microscopic models of nuclear properties that give an accurate description of existing data and are reliable for predictions far away from the stability line. The need for more microscopic input parameters has led to new devel- opments within the Hartree-Fock-Bogoliubov method, some of which are presented in this paper.

EXOTIC NUCLEAR STRUCTURES OF LIGHT UNSTABLE NUCLEI VIA REACTION CROSS SECTION MEASUREMENT

2010 ◽  
Vol 25 (21n23) ◽  
pp. 2014-2015
Author(s):  
D. NISHIMURA ◽  
M. FUKUDA ◽  
M. TAKECHI ◽  
M. MIHARA ◽  
J. KOMURASAKI ◽  
...  
Keyword(s):  
Cross Sections ◽  
Reaction Cross ◽  
Neutron Density ◽  
Nuclear Surface ◽  
Transmission Method ◽  
Density Distributions ◽  
Unstable Nuclei ◽  
Glauber Theory ◽  
Nuclear Structures ◽  
Reaction Cross Sections

Reaction cross sections for 11 Be and 8 B on proton targets at 40A - 120A MeV have been measured by the transmission method. With these data, we can discuss the proton- and neutron- density distributions at the nuclear surface independently in principle using the Glauber theory. Our experimental results support that the constituent of halo in 11 Be is neutron dominantly and that of 8 B is proton dominantly.

NEW CALCULATION FOR SOME GROUND STATE FEATURES OF 40Ca, 48Ca32S AND 39K NUCLEI

2010 ◽  
Vol 19 (02) ◽  
pp. 291-298 ◽  
Author(s):  
H. AYTEKIN ◽  
R. BALDIK ◽  
E. TEL ◽  
A. AYDIN
Keyword(s):  
Ground State ◽  
Nuclear Charge ◽  
Mean Field ◽  
Binding Energies ◽  
Charge Radii ◽  
Hartree Fock ◽  
Relativistic Mean Field ◽  
Density Distributions ◽  
Total Binding ◽  
Experimental Values

Some ground states features of 32 S , 39 K , 40 Ca and 48 Ca nuclei are investigated using the Hartree–Fock method with the Skyrme SKM * and SLy4 forces calculated in two different code implementations. The calculated total binding energies per particle and root mean square (rms) nuclear charge radii using the Skyrme–Hartree–Fock (SHF) + BCS method are compared with relativistic mean-field (RMF) theory and experimental values. The obtained charge density distributions from these code implementations are compared with the experimental data. Pairing effects are also included in calculations for the same nuclei. Variations of the total binding energies per particle and rms nuclear charge radii were investigated as the last shell nucleons were carried to the upper shell.

An investigation of nuclear properties of even–even natural 92–100Mo isotopes

2014 ◽  
Vol 29 (39) ◽  
pp. 1450208 ◽  
Author(s):  
Ozan Artun ◽  
Çağlar Aytekin ◽  
Hüseyin Aytekin
Keyword(s):  
Nuclear Structure ◽  
Root Mean Square ◽  
Binding Energies ◽  
Experimental Results ◽  
Mean Square ◽  
Charge Radii ◽  
Hartree Fock ◽  
Helium 3 ◽  
Mo Isotopes

In this study, we have calculated the basic nuclear properties such as binding energies, root mean square (rms) charge radii, and neutron and proton densities of the even–even natural 92–100 Mo isotopes. Investigations were performed using the Hartree–Fock–Bogoliubov (HFB) method with different Skyrme-like forces. Separation energies, which have an important role in nuclear structure, of neutron, proton, deuteron, triton, helium-3 and alpha were also investigated with TALYS 1.4 code. The calculated results were discussed and compared with experimental results.

Isotopic dependence of the nuclear charge radii and binding energies in the relativistic Hartree-Fock formalism

2012 ◽  
Vol 75 (3) ◽  
pp. 269-284 ◽  
Author(s):  
R. Niembro ◽  
S. Marcos ◽  
M. López-Quelle ◽  
L. N. Savushkin
Keyword(s):  
Nuclear Charge ◽  
Binding Energies ◽  
Charge Radii ◽  
Hartree Fock ◽  
Isotopic Dependence

Nuclear structure properties in neutron stars

2020 ◽  
Vol 29 (09) ◽  
pp. 2050079
Author(s):  
Ozan Artun
Keyword(s):  
Energy Levels ◽  
Form Factors ◽  
Particle Energy ◽  
Binding Energies ◽  
Pb Isotopes ◽  
Neutron Density ◽  
Neutron Skin ◽  
Mass Model ◽  
Hartree Fock ◽  
Density Distributions

The charge, proton and neutron density distributions along with nuclear properties were calculated by Hartree–Fock approach with Skyrme force interaction for isotopic Pb chain ([Formula: see text]). The effects of correlation on neutron skin thicknesses by obtaining bulk and surface contributions were analyzed by three different approaches. The occurrence of the nuclei with bubble structure due to central depletion in nucleonic was investigated for Pb isotopes as a function of relative neutron excess [Formula: see text]. The important role of the bubble effect in heavy region was explained by the relation between Coulomb and nn-interaction. The single particle energy levels were determined by each [Formula: see text] state of stable Pb isotopes, as well as charge form factors [Formula: see text]. Besides, the average neutron–proton [Formula: see text] and residual neutron–proton [Formula: see text] interactions of the Pb isotopes were calculated by the theoretical binding energies. The fluctuations in the obtained results were considered in detail because its variation may give a good criterion for the mass model approaches.

The cross sections for different channels in heavy ion nuclear reactions

1971 ◽  
Vol 32 (1) ◽  
pp. 7-9 ◽  
Author(s):  
J. Galin ◽  
D. Guerreau ◽  
M. Lefort ◽  
X. Tarrago
Keyword(s):  
Cross Sections ◽  
Nuclear Reactions ◽  
Heavy Ion ◽  
The Cross

Polaronic and Bipolaronic Enhancement of Second Hyperpolarizabilities in Dithienyl Polyenes from Ab Initio Quantum Methods

1999 ◽  
Vol 597 ◽  
Author(s):  
Steven Trohalaki ◽  
Robert J. Zellmer ◽  
Ruth Pachter
Keyword(s):  
Ab Initio ◽  
Density Functional ◽  
Valence Bond ◽  
Closed Shell ◽  
Functional Theory ◽  
Molecular Conformations ◽  
Hartree Fock ◽  
Molecular Charge ◽  
Field Methodology ◽  
Moller Plesset

AbstractSpangler and He [1,2] have shown that dithienyl polyenes form extremely stable bipolaronic dications when oxidatively doped in solution. Previous theoretical studies applied empirical methods to predict bipolaronic enhancement of hyperpolarizabilities for simple polyenes [3,4]. Here, we employ density functional theory to optimize the gas-phase molecular conformations of neutral, cationic, and dicationic forms of a series of dithienyl polyenes, where the number of ethene units, N, is varied from 1–5. Ab initio Hartree-Fock, generalized valence bond, configuration interaction, and Møller-Plesset calculations demonstrate that the dications are farily well described with a closed shell and therefore have little biradicaloid character. Second hyperpolarizabilities, γ, are subsequently calculated using ab initio Hartree-Fock theory and a finite field methodology. As expected, γ increases with the number of ethene units for a given molecular charge. The cations also show the largest increase in γ with N. For a given value of N, the cations display the largest γ values. However, if we treat the dication as a triplet, which might be present in solution, then it displays the largest γ.

AN INVESTIGATION ON SHAPE EVOLUTION OF Ti ISOTOPES WITH HARTREE–FOCK–BOGOLIUBOV THEORY

2012 ◽  
Vol 27 (28) ◽  
pp. 1250162 ◽  
Author(s):  
TUNCAY BAYRAM
Keyword(s):  
Potential Energy ◽  
Single Particle ◽  
Potential Energy Curves ◽  
Shape Evolution ◽  
Shape Transition ◽  
Hartree Fock ◽  
Bogoliubov Theory ◽  
Unstable Nuclei

Constrained Hartree–Fock–Bogoliubov theory with SLy4 and SLy5 Skyrme forces is used to investigate the shape transition between spherical and γ-unstable nuclei in 38–66 Ti . By examining potential energy curves and neutron single-particle levels of even–even Ti isotopes, 46,52,60 Ti are suggested as possible candidates of the nuclei with E(5) symmetry.

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